Actually, the traceback says what's happening is CookHeaders is trying
to create the List-Id: header to be added to the message.
It tries to create a header of the form:
List-Id: list description
m.preferred_language 'en' m.description 'My List one'
(of course the list name and responses will be different in your case.) ** Changed in: mailman Importance: Undecided => Medium ** Changed in: mailman Status: New => Incomplete ** Changed in: mailman Milestone: None => 2.1.21 ** Changed in: mailman Assignee: (unassigned) => Mark Sapiro (msapiro) -- You received this bug notification because you are a member of Mailman Coders, which is subscribed to GNU Mailman. https://bugs.launchpad.net/bugs/1462755 Title: qrunner crashes on invalid unicode sequence To manage notifications about this bug go to: https://bugs.launchpad.net/mailman/+bug/1462755/+subscriptions